R+L = J but Dany and Jon aren't related
Without a doubt the showrunners are doing some sparking between Dany and Jon, and it's likely that some sort of frisson between the two was planned by GRRM as well because we know DnD screentested Kit and Emilia very early on for romantic chemistry down the road. But I'm having a devil of a time trying to imagine scenarios in which this would not be gross because of incest. Using either/or/and book and show knowledge, is there any way we get some kind of revelation that they aren't related or at least not as closely as we think they are? Since Dany is so clearly Targ by physical appearance she would need to have at least one Targ (or maybe Blackfyre?) parent.